Engine.



ENGINE.

APPLICATION FILED JULY 10, 1911.

Patented Oct. 17, 1911.

T l Y TNESSEE UNITED STATES PATENT OFFICE.

WILLIAM H. CAMERON, 0F TOLEDO, OHIO, ASSIGNOR-TO THE WILLYS-OVERLAND AUTO- MOBILE COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

ENGINE.

To all whom it may concern:

Be it known that I, IVILLIAM H. CAM- ERON, a citizen of the United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to engine construction, and has for its object the provision of simple and efficient means for causing a return to the crank-case of oil which works out around the reciprocating valve rods, thus preventing a running over of such oil upon the external parts of the engine and obviating the dirt and unsightliness incident thereto.

The invention is fully described in the following specification, and while in its broader aspect it is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which,

Figure l is a side elevation of a portion of an engine with the portion embodying my invention in central longitudinal section, and Fig. 2 is a cross-section on the line a: a; in Fig. 1.

Referring to the drawings, 1 designates the casing of an engine cylinder, 2 the top of the crank-case thereof, 3 a valve-operating push-rod which works through a guide boss t on the crank-case, and 5 a cam-shaft, which is located within the crank-case and coacts with the lower ends of the several valve-rods of an engine to operate the same, all of which features are common particularly in connection with internal combustion engines.

The portion of the valve rod 3 which works through the boss 4 is encircled by a bearing-bushing 6, which has a close fit within the bore of said boss and is preferably provided at its lower end with a radial flange or stop-shoulder 7 for limiting its upward movement in the boss.

It is found in practice that the reciprocatory action of a valve rod 3 within its crank-case bearing in either the boss 4 or Specification of Letters Patent.

Application filed Ju1y'10, 1911.

Patented Oct. 17, 1911.

Serial No. 637,732.

bushing 6, if the latter is employed, as is customarily the case, causes the oil which is in the crank-case to work out between the rod and its bearing and run over the top of the boss and down upon the crank-case top 2. To avoid this the upper end of the bushing 6 is terminated short of the upper end of the boss 4 to provide a receptacle 8 for receiving the oil which escapes from around the rod 3, and exit passages 9 are provided from said receptacle to the interior of the crank-case to permit a return of such oil to the crank-case chamber. The passages 9 are shown, in the present instance, as being formed by grooves which are provided longitudinally of the peripheral portion of the bushing 6 in opposite sides thereof and extend at their lower ends through the flange or shoulder 7 at the lower end of the bushing. It is preferable to place the passages 9 in such positions that their lower ends terminate over the cam-shaft 5, whereby the oil which is returned to the crank case through said passages drops upon said shaft and serves to lubricate the points of contact therewith the lower ends of the push rods 3.

It is preferable to close the top of the receptacle 8 by an annulus 10 to prevent the entrance of dust or dirt within such receptacle, said annulus being mounted on the upper end of the boss and encircling the associated valve rod.

By the use of my invention it is found that the escape of oil without the upper ends of the bosses 4 is entirely prevented as all of the oil which is elevated within the bosses by the action of the valve rods enters the receptacles 8 and thence flows back to the crankchamber through the drainage passages 9.

l[ wish it understood that my invention is not limited to any specific construction or arrangement of the parts except in so far as such limitations are specified in the claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is,

1. In an engine, the combination with a crank-case having valve rod bearings therein and the valve rods working in said bearings, of bushings mounted in said bearings and terminating short of the upper ends thereof to cooperate therewith to form receptacles for receiving oil which works outwardly from the crank-case around the rods, said bushings having drainage passages provided longitudinally thereof in communication at their outer ends with said receptacles and at their inner ends with the interior of the crank-case, and closure means for the top of said receptacle.

'2. In an engine, the combination with a crank case, reciprocal valve rods, bearings therefor in the crank-case, and a cam shaftwithin the crank-case, of means for returning to the interior of the crank-case oil which works outwardly therefrom around the valve rods and directing such returned oil upon the cam-shaft.

3. In an engine, the combination of a crankcase having valve rod bearing bosses rising therefrom, bushings projected within said bosses from the interior of the crank case and terminating at their upper ends short of the upper ends of the bosses to form receptacles, said bushings having drainage passages provided longitudinally therethrough in communication at their outer ends with said receptacles and at their inner ends with the interior of the crank case, a washer-like member secured to the upper end of each boss and closing the upper end of the associated receptacle, a valve rod boss, said bushing having passages provided lengthwise therethrough with their lower ends disposed over the cam shaft, a valve rod workin tuated by said shaft, and a washer-like member encircling the valve rod and cooperating with the upper ends of said boss and bushing to form an annular chamber around the valve rod for receiving oil which works up through said bushin and acaround said rod, such oil being returned to the crank case through said bushing passages.

In testimony whereof, I have hereunto signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM H. CAMERON.

Witnesses C. W. OWEN, E. E. THOMAS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

